However, when symptoms occur, often due to the underlying condition rather than the elevated B12 itself, they may include 12 : Acne Headaches Anxiety Irregular heartbeats Trouble falling or staying asleep Nausea Fatigue Dizziness The symptoms of high vitamin B 12 are vague
Usage Subcutaneous injection of 250-500g daily, recommended cycle of 8-12 weeks, specific dosage based on body weight and medical advice
The Hospira and Pfizer prescribing label contains no 28-day statement at all
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[1] However, whilst acute toxicity is rare, elevated serum B12 levels can occasionally occur and may warrant investigation, particularly when they arise unexpectedly or in the context of certain medical conditions
That said, here are the benefits of B12 injections